#include <STC89C5xRC.H>
void Delay(unsigned int xms)		//@12.000MHz
{
	unsigned char data i, j;
	while(xms--)
	{
		i = 2;
		j = 239;
		do
		{
			while (--j);
		} while (--i);
	}
	
}

void main()
{
	unsigned char LEDnum=0;
	while(1)
	{
		if(P30==0)
		{
			Delay(20);
			while(P30==0);
			Delay(20);
			
			LEDnum++;
			P2=~LEDnum;
		}
	}
}